无序多孔介质中离子流体$2$：$1$原始模型的汽液临界参数
Vapour-liquid critical parameters of a $2$:$1$ primitive model of ionic fluids confined in disordered porous media
摘要：
本文用集合变量法和扩展的标度粒子理论相结合的方法研究了无序多孔介质中离子流体的汽液临界参数。离子流体被描述为一个两个组件的电荷和大小不对称的原始模型，和多孔介质被建模为由硬球障碍物形成的无序矩阵。在固定化合价$2$：$1$的特定情况下，对于不同的基质孔隙率以及对于不同直径的基质和流体颗粒计算共存曲线和相应的临界参数。结果表明，约化临界温度和约化临界密度随微观特征的变化趋势与单价体的变化趋势相似。同时，注意到离子电荷不对称性显著削弱了基质存在的影响。
英文摘要：
We study the vapour-liquid critical parameters of an ionic fluid confined in a disordered porous medium by using the theory which combines the collective variables approach with an extension of the scaled particle theory. The ionic fluid is described as a two-component charge- and size-asymmetric primitive model, and a porous medium is modelled as a disordered matrix formed by hard-spheres obstacles. In the particular case of the fixed valencies $2$:$1$, the coexistence curves and the corresponding critical parameters are calculated for different matrix porosities as well as for different diameters of matrix and fluid particles. The obtained results show that the general trends of the reduced critical temperature and the reduced critical density with the microscopic characteristics are similar to the trends obtained in the monovalent case. At the same time, it is noticed that an ion charge asymmetry significantly weakens the effect of the matrix presence.
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